Year	Number of
1990	64.98
1991	64.9
1992	65.79
1993	66.8
1994	67.92
1995	69.55
1996	72.13
1997	73.56
1998	78.01
1999	82.22
2000	86.36
2001	87.5
2002	89.86
2003	95.05
2004	101.55
2005	108.41
2006	116.51
2007	123.65
2008	129.98
2009	136.6
2010	142.45
2011	148.84
2012	159.1
2013	169.6
2014	180.88
2015	191.86
2016	202.24